How is stained glass made? a. adding metallic oxides to sand and ash or lime, then infusing at high temperatures b. adding metallic oxides to salt, then infusing over time at low temperatures c. adding metallic oxides to sulfur, then infusing at high temperatures d. adding metallic oxides to sulfur, then infusing at low temperatures?

adding metallic oxides to sand and ash or lime, then infusing at high temperatures

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.